i just got some hope minis and they aren't working to well. i can pull them about a half an inch before the pistons start to move. they feel spongy? is that the right word. i read that i should add brake fluid if this happens. it said to take the master cylinder top off, and squeeze the lever till it gets better. then fill the resevoir back up. i tried that and the fluid level in the resevoir doesn't move and they feel the same. What should i do?